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1d0ea069 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
c08098f2 VG |
2 | /* |
3 | * Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) | |
c08098f2 VG |
4 | */ |
5 | ||
6 | #include <linux/ptrace.h> | |
0ef88a54 VG |
7 | #include <linux/module.h> |
8 | #include <linux/mm.h> | |
9 | #include <linux/fs.h> | |
10 | #include <linux/kdev_t.h> | |
0ef88a54 VG |
11 | #include <linux/proc_fs.h> |
12 | #include <linux/file.h> | |
6e84f315 | 13 | #include <linux/sched/mm.h> |
b17b0153 | 14 | #include <linux/sched/debug.h> |
6e84f315 | 15 | |
0ef88a54 | 16 | #include <asm/arcregs.h> |
1f6ccfff | 17 | #include <asm/irqflags.h> |
0ef88a54 | 18 | |
ab6c0367 VG |
19 | #define ARC_PATH_MAX 256 |
20 | ||
0ef88a54 VG |
21 | /* |
22 | * Common routine to print scratch regs (r0-r12) or callee regs (r13-r25) | |
23 | * -Prints 3 regs per line and a CR. | |
24 | * -To continue, callee regs right after scratch, special handling of CR | |
25 | */ | |
26 | static noinline void print_reg_file(long *reg_rev, int start_num) | |
27 | { | |
28 | unsigned int i; | |
29 | char buf[512]; | |
30 | int n = 0, len = sizeof(buf); | |
31 | ||
0ef88a54 VG |
32 | for (i = start_num; i < start_num + 13; i++) { |
33 | n += scnprintf(buf + n, len - n, "r%02u: 0x%08lx\t", | |
34 | i, (unsigned long)*reg_rev); | |
35 | ||
36 | if (((i + 1) % 3) == 0) | |
37 | n += scnprintf(buf + n, len - n, "\n"); | |
38 | ||
bd3c8b11 | 39 | /* because pt_regs has regs reversed: r12..r0, r25..r13 */ |
1f6ccfff VG |
40 | if (is_isa_arcv2() && start_num == 0) |
41 | reg_rev++; | |
42 | else | |
43 | reg_rev--; | |
0ef88a54 VG |
44 | } |
45 | ||
46 | if (start_num != 0) | |
47 | n += scnprintf(buf + n, len - n, "\n\n"); | |
48 | ||
bd3c8b11 VG |
49 | /* To continue printing callee regs on same line as scratch regs */ |
50 | if (start_num == 0) | |
51 | pr_info("%s", buf); | |
52 | else | |
53 | pr_cont("%s\n", buf); | |
0ef88a54 VG |
54 | } |
55 | ||
56 | static void show_callee_regs(struct callee_regs *cregs) | |
57 | { | |
58 | print_reg_file(&(cregs->r13), 13); | |
59 | } | |
60 | ||
ab6c0367 | 61 | static void print_task_path_n_nm(struct task_struct *tsk) |
0ef88a54 | 62 | { |
0ef88a54 VG |
63 | char *path_nm = NULL; |
64 | struct mm_struct *mm; | |
65 | struct file *exe_file; | |
ab6c0367 | 66 | char buf[ARC_PATH_MAX]; |
0ef88a54 VG |
67 | |
68 | mm = get_task_mm(tsk); | |
69 | if (!mm) | |
70 | goto done; | |
71 | ||
72 | exe_file = get_mm_exe_file(mm); | |
73 | mmput(mm); | |
74 | ||
75 | if (exe_file) { | |
ab6c0367 | 76 | path_nm = file_path(exe_file, buf, ARC_PATH_MAX-1); |
0ef88a54 | 77 | fput(exe_file); |
0ef88a54 VG |
78 | } |
79 | ||
80 | done: | |
9bf39ab2 | 81 | pr_info("Path: %s\n", !IS_ERR(path_nm) ? path_nm : "?"); |
0ef88a54 | 82 | } |
0ef88a54 | 83 | |
ab6c0367 | 84 | static void show_faulting_vma(unsigned long address) |
0ef88a54 VG |
85 | { |
86 | struct vm_area_struct *vma; | |
5040573e | 87 | struct mm_struct *active_mm = current->active_mm; |
0ef88a54 | 88 | |
bd3c8b11 VG |
89 | /* can't use print_vma_addr() yet as it doesn't check for |
90 | * non-inclusive vma | |
91 | */ | |
5040573e DB |
92 | down_read(&active_mm->mmap_sem); |
93 | vma = find_vma(active_mm, address); | |
0ef88a54 VG |
94 | |
95 | /* check against the find_vma( ) behaviour which returns the next VMA | |
96 | * if the container VMA is not found | |
97 | */ | |
98 | if (vma && (vma->vm_start <= address)) { | |
ab6c0367 VG |
99 | char buf[ARC_PATH_MAX]; |
100 | char *nm = "?"; | |
101 | ||
1e3bece2 | 102 | if (vma->vm_file) { |
ab6c0367 | 103 | nm = file_path(vma->vm_file, buf, ARC_PATH_MAX-1); |
1e3bece2 EP |
104 | if (IS_ERR(nm)) |
105 | nm = "?"; | |
0ef88a54 VG |
106 | } |
107 | pr_info(" @off 0x%lx in [%s]\n" | |
bd3c8b11 VG |
108 | " VMA: 0x%08lx to 0x%08lx\n", |
109 | vma->vm_start < TASK_UNMAPPED_BASE ? | |
110 | address : address - vma->vm_start, | |
111 | nm, vma->vm_start, vma->vm_end); | |
5040573e | 112 | } else |
0ef88a54 | 113 | pr_info(" @No matching VMA found\n"); |
5040573e DB |
114 | |
115 | up_read(&active_mm->mmap_sem); | |
0ef88a54 VG |
116 | } |
117 | ||
118 | static void show_ecr_verbose(struct pt_regs *regs) | |
119 | { | |
502a0c77 | 120 | unsigned int vec, cause_code; |
0ef88a54 VG |
121 | unsigned long address; |
122 | ||
502a0c77 | 123 | pr_info("\n[ECR ]: 0x%08lx => ", regs->event); |
0ef88a54 VG |
124 | |
125 | /* For Data fault, this is data address not instruction addr */ | |
126 | address = current->thread.fault_address; | |
127 | ||
502a0c77 VG |
128 | vec = regs->ecr_vec; |
129 | cause_code = regs->ecr_cause; | |
0ef88a54 VG |
130 | |
131 | /* For DTLB Miss or ProtV, display the memory involved too */ | |
132 | if (vec == ECR_V_DTLB_MISS) { | |
65464152 VG |
133 | pr_cont("Invalid %s @ 0x%08lx by insn @ 0x%08lx\n", |
134 | (cause_code == 0x01) ? "Read" : | |
135 | ((cause_code == 0x02) ? "Write" : "EX"), | |
0ef88a54 VG |
136 | address, regs->ret); |
137 | } else if (vec == ECR_V_ITLB_MISS) { | |
138 | pr_cont("Insn could not be fetched\n"); | |
139 | } else if (vec == ECR_V_MACH_CHK) { | |
aa7e3a5e | 140 | pr_cont("Machine Check (%s)\n", (cause_code == 0x0) ? |
0ef88a54 VG |
141 | "Double Fault" : "Other Fatal Err"); |
142 | ||
143 | } else if (vec == ECR_V_PROTV) { | |
144 | if (cause_code == ECR_C_PROTV_INST_FETCH) | |
145 | pr_cont("Execute from Non-exec Page\n"); | |
76551468 EP |
146 | else if (cause_code == ECR_C_PROTV_MISALIG_DATA && |
147 | IS_ENABLED(CONFIG_ISA_ARCOMPACT)) | |
0ef88a54 | 148 | pr_cont("Misaligned r/w from 0x%08lx\n", address); |
65464152 VG |
149 | else |
150 | pr_cont("%s access not allowed on page\n", | |
151 | (cause_code == 0x01) ? "Read" : | |
152 | ((cause_code == 0x02) ? "Write" : "EX")); | |
0ef88a54 VG |
153 | } else if (vec == ECR_V_INSN_ERR) { |
154 | pr_cont("Illegal Insn\n"); | |
1f6ccfff VG |
155 | #ifdef CONFIG_ISA_ARCV2 |
156 | } else if (vec == ECR_V_MEM_ERR) { | |
157 | if (cause_code == 0x00) | |
158 | pr_cont("Bus Error from Insn Mem\n"); | |
159 | else if (cause_code == 0x10) | |
160 | pr_cont("Bus Error from Data Mem\n"); | |
161 | else | |
162 | pr_cont("Bus Error, check PRM\n"); | |
76551468 EP |
163 | } else if (vec == ECR_V_MISALIGN) { |
164 | pr_cont("Misaligned r/w from 0x%08lx\n", address); | |
1f6ccfff | 165 | #endif |
f5a16b93 VG |
166 | } else if (vec == ECR_V_TRAP) { |
167 | if (regs->ecr_param == 5) | |
168 | pr_cont("gcc generated __builtin_trap\n"); | |
0ef88a54 VG |
169 | } else { |
170 | pr_cont("Check Programmer's Manual\n"); | |
171 | } | |
172 | } | |
173 | ||
174 | /************************************************************************ | |
175 | * API called by rest of kernel | |
176 | ***********************************************************************/ | |
c08098f2 VG |
177 | |
178 | void show_regs(struct pt_regs *regs) | |
179 | { | |
0ef88a54 VG |
180 | struct task_struct *tsk = current; |
181 | struct callee_regs *cregs; | |
0ef88a54 | 182 | |
f731a8e8 VG |
183 | /* |
184 | * generic code calls us with preemption disabled, but some calls | |
185 | * here could sleep, so re-enable to avoid lockdep splat | |
186 | */ | |
187 | preempt_enable(); | |
188 | ||
ab6c0367 | 189 | print_task_path_n_nm(tsk); |
a43cb95d | 190 | show_regs_print_info(KERN_INFO); |
0ef88a54 | 191 | |
502a0c77 | 192 | show_ecr_verbose(regs); |
0ef88a54 | 193 | |
bd3c8b11 VG |
194 | pr_info("[EFA ]: 0x%08lx\n[BLINK ]: %pS\n[ERET ]: %pS\n", |
195 | current->thread.fault_address, | |
196 | (void *)regs->blink, (void *)regs->ret); | |
0ef88a54 | 197 | |
bd3c8b11 | 198 | if (user_mode(regs)) |
ab6c0367 | 199 | show_faulting_vma(regs->ret); /* faulting code, not data */ |
0ef88a54 | 200 | |
bd3c8b11 VG |
201 | pr_info("[STAT32]: 0x%08lx", regs->status32); |
202 | ||
1f6ccfff | 203 | #define STS_BIT(r, bit) r->status32 & STATUS_##bit##_MASK ? #bit" " : "" |
0ef88a54 | 204 | |
1f6ccfff VG |
205 | #ifdef CONFIG_ISA_ARCOMPACT |
206 | pr_cont(" : %2s%2s%2s%2s%2s%2s%2s\n", | |
207 | (regs->status32 & STATUS_U_MASK) ? "U " : "K ", | |
208 | STS_BIT(regs, DE), STS_BIT(regs, AE), | |
209 | STS_BIT(regs, A2), STS_BIT(regs, A1), | |
210 | STS_BIT(regs, E2), STS_BIT(regs, E1)); | |
211 | #else | |
212 | pr_cont(" : %2s%2s%2s%2s\n", | |
213 | STS_BIT(regs, IE), | |
214 | (regs->status32 & STATUS_U_MASK) ? "U " : "K ", | |
215 | STS_BIT(regs, DE), STS_BIT(regs, AE)); | |
216 | #endif | |
bd3c8b11 VG |
217 | pr_info("BTA: 0x%08lx\t SP: 0x%08lx\t FP: 0x%08lx\n", |
218 | regs->bta, regs->sp, regs->fp); | |
0ef88a54 VG |
219 | pr_info("LPS: 0x%08lx\tLPE: 0x%08lx\tLPC: 0x%08lx\n", |
220 | regs->lp_start, regs->lp_end, regs->lp_count); | |
221 | ||
222 | /* print regs->r0 thru regs->r12 | |
223 | * Sequential printing was generating horrible code | |
224 | */ | |
225 | print_reg_file(&(regs->r0), 0); | |
226 | ||
227 | /* If Callee regs were saved, display them too */ | |
228 | cregs = (struct callee_regs *)current->thread.callee_reg; | |
229 | if (cregs) | |
230 | show_callee_regs(cregs); | |
f731a8e8 VG |
231 | |
232 | preempt_disable(); | |
c08098f2 VG |
233 | } |
234 | ||
235 | void show_kernel_fault_diag(const char *str, struct pt_regs *regs, | |
38a9ff6d | 236 | unsigned long address) |
c08098f2 | 237 | { |
0ef88a54 | 238 | current->thread.fault_address = address; |
0ef88a54 | 239 | |
aa7e3a5e JA |
240 | /* Show fault description */ |
241 | pr_info("\n%s\n", str); | |
242 | ||
0ef88a54 VG |
243 | /* Caller and Callee regs */ |
244 | show_regs(regs); | |
245 | ||
246 | /* Show stack trace if this Fatality happened in kernel mode */ | |
247 | if (!user_mode(regs)) | |
248 | show_stacktrace(current, regs); | |
c08098f2 | 249 | } |